Cutter knife



FIG. 1 is a perspective view taken from the front, right side and bottom of the cutter knife of my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a left side elevationla view thereof;

FIG. 5 is a right side elevational view thereof;

FIG. 6 is a bottom plan view thereof (enlarged); and,

FIG. 7 is a top plan view thereof (enlarged); 

The ornamental design for a cutter knife, as shown and described. 